|
Which of the following is a product of the light reactions of photosynthesis?
A. high-energy photons
B. water and CO2
C. glyceraldehyde-3-phosphate
D. NADP+ and RuBP
E. oxygen, ATP, and NADPH
|
E. oxygen, ATP, and NADPH
|
|
When light strikes chlorophyll molecules, they lose electrons, which are ultimately replaced by ___________
A. splitting water
B. removing them from NADPH
C. fixing carbon
D. breaking down ATP
E. oxidizing glucose
|
A. splitting water
|
|
Which of the following products of the light reactions of photosynthesis is consumed during the Calvin cycle?
A. sugar
B. NADPH
C. oxygen
D. ADP + Pi
E. water
|
B. NADPH
|
|
The overall function of the Calvin cycle is _____.
A. oxidizing glucose
B. capturing sunlight
C. splitting water
D. producing carbon dioxide
E. making sugar
|
E. making sugar
|
|
C4 plants occur more commonly in desert conditions because _____.
A. the stomata open at night and close in the day
B. they store carbon by incorporating CO2 into organic acids that are later catabolized
C. they produce carbon dioxide internally via photorespiration
D. they produce water as a product of their photosynthetic pathways
E. they can fix carbon at the lower CO2 concentrations that develop when the stomata are closed
|
E. they can fix carbon at the lower CO2 concentrations that develop when the stomata are closed
|
|
Select the most accurate statement describing the basic function of the light reactions of photosynthesis.
A. The basic function of the light reactions of photosynthesis is the conversion of solar energy to chemical energy.
B. The basic function of the light reactions of photosynthesis is the trapping of light energy.
C. The basic function of the light reactions of photosynthesis is the production of glucose.
|
A. The basic function of the light reactions of photosynthesis is the conversion of solar energy to chemical energy.
|
|
Select the correct molecule that is the main product of the Calvin cycle.
A. Glucose
B. NADPH
C. G3P
|
C. G3P
|
|
What is the basic role of CO2 in photosynthesis?
A. CO2 is fixed or incorporated into organic molecules.
B. CO2 is a source of electrons in the formation of organic molecules.
C. CO2 is taken in by plants as a form of inverse respiration, in which carbon dioxide is "breathed in" and oxygen is "breathed out."
|
A. CO2 is fixed or incorporated into organic molecules.
|
|
Select the correct statement about the Calvin cycle.
A. The Calvin cycle has three phases: carbon fixation, reduction, and regeneration of RuBP.
B. The Calvin cycle takes place primarily in the dark.
C. The basic function of the Calvin cycle is the conversion of solar energy to chemical energy.
|
A. The Calvin cycle has three phases: carbon fixation, reduction, and regeneration of RuBP.
|
|
Why are plants classified as producers?
A. Plants are classified as producers because they fix inorganic carbon into organic molecules.
B. Plants are classified as producers because they produce oxygen.
C. Plants are classified as producers because they are at the bottom of the food chain.
|
A. Plants are classified as producers because they fix inorganic carbon into organic molecules.
|
|
The light reactions of photosynthesis supply the Calvin cycle with
A. light energy.
B. CO2 and ATP.
C. H2O and NADPH.
D. ATP and NADPH.
E. sugar and O2 .
|
D. ATP and NADPH.
|
|
Which of the following sequences correctly represents the flow of electrons during photosynthesis?
A. H20- NADPH – Calvin cycle
B. NADPH – electron transport chain-O2
C.NADPH -O2-CO2
D. NADPH – chlorophyll – Calvin cycle
E. H20- photosystem I – photosystem II
|
A. H20- NADPH – Calvin cycle
|
|
How is photosynthesis similar in C4 plants and CAM plants?
A. In both cases, thylakoids are not involved in photosynthesis.
B. In both cases, rubisco is not used to fix carbon initially.
C. In both cases, only photosystem I is used.
D. Both types of plants make most of their sugar in the dark.
E. Both types of plants make sugar without the Calvin cycle.
|
B. In both cases, rubisco is not used to fix carbon initially.
|
|
Which of the following statements is a correct distinction between autotrophs and heterotrophs?
A. Only heterotrophs require chemical compounds from the environment.
B. Only heterotrophs have mitochondria.
C. Only heterotrophs require oxygen.
D. Autotrophs, but not heterotrophs, can nourish themselves beginning CO2 with and other nutrients that are inorganic.
E. Cellular respiration is unique to heterotrophs.
|
D. Autotrophs, but not heterotrophs, can nourish themselves beginning CO2 with and other nutrients that are inorganic.
|
|
Which of the following does not occur during the Calvin cycle?
A.consumption of ATP
B. carbon fixation
C. oxidation of NADPH
D. regeneration of the CO2 acceptor
E. release of oxygen
|
E. release of oxygen
|
|
In mechanism, photophosphorylation is most similar to
A. the Calvin cycle.
B. reduction of NADP+.
C. carbon fixation.
D. oxidative phosphorylation in cellular respiration.
E. substrate-level phosphorylation in glycolysis.
|
D. oxidative phosphorylation in cellular respiration.
|
|
Which process is most directly driven by light energy?
A. removal of electrons from chlorophyll molecules
B. ATP synthesis
C. reduction of NADP+ molecules
D. carbon fixation in the stroma
E. creation of a pH gradient by pumping protons across the thylakoid membrane
|
A. removal of electrons from chlorophyll molecules
|
